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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Magnetization and Demagnetization Dynamics I

MA 16.2: Vortrag

Dienstag, 8. März 2016, 09:45–10:00, H34

Optically induced magnetization dynamics probed by Lorentz microscopy — •Marcel Möller1, Tim Eggebrecht2, Nara Rubiano da Silva1, Jan Gregor Gatzmann1, Theo Diekmann1, Armin Feist1, Ulrike Martens3, Henning Ulrichs2, Vladyslav Zbarsky2, Markus Münzenberg3, Claus Ropers1, and Sascha Schäfer114th Physical Institute, University of Göttingen, Germany — 21st Physical Institute, University of Göttingen, Germany — 3Interface and Surface Physics, University of Greifswald, Germany

Combining Lorentz microscopy with in-situ optical excitation promises fascinating new insights into magnetization dynamics. Following two different approaches, first we present the generation of a dense vortex-antivortex network by a single intense femtosecond laser pulse in a thin continuous Fe/SN bilayer. The spatial distribution of the vortex-antivortex network exhibits glasslike properties, with well-defined short-range correlations. The formation of the defect network is explained with a Kibble-Zurek-type mechanism involving a rapid temperature quench from the paramagnetic to the ferromagnetic phase.

Secondly, we will report on the ultrafast Lorentz imaging of nanostructured magnetic thin films. Applying a electron-pump/laser-probe scheme using an ultrafast transmission electron microscope (UTEM) will yield access to temporally and spatially resolved magnetization dynamics.

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